Fluid rotor



Patente'rl Sept. 17, 1929 UNITED STATES CLYnE C. BUTLER, or CINCINNATI,oHIo, AssIeNoR To THE CINCINNATI BALI. ca ANx COMPANY, or CINCINNATI,omo, A CORPORATION or oHIo PATENT Tot-FICE X FLUID ROTOR Application ledApril 28,

This invention relates to rotary pumps of a type adapted to dischargefluid and particularly a 1i uid under pressure.

,v The object of t e invention is to provide a rotary pump adapted todeliver a relatively large volume of liquid at a comparatively highpressure with a minimum amount of power in relation tov said volume andpressure.

Further objects and advantages will be more fully set forth in adescription of the accompanying drawings, forming apart of thisspecification, in which:

Figure 1 is a central section taken longitudinally of the pump.

Figure 2 is a sectional view taken on line 2 2, Figure 1.

Figure 3 is a sectional view taken on lines 3 3, Figure 1, showing agear of the pump in section. A

Figure 4 is a perspective view of a tooth of a gear detailing theformation thereof.

The pump of this invent-ion comprises a closure, the constitutingmembers of which are a casing l and two closure plates or members 3 and4 secured to the casing by means of bolts 5, gasket members 6 beingdisposed between the casing and the closure plates.

The casing is also provided with legs 7, by means of which the casing issecured to its support (not shown).

Inside of the casing are disposed spur gears 8 and 9 in intermeshingrelationship, these gears being secured to shafts 1() and 11 by meansvof keys 12-12.

These shafts are journalled in the Closure plates 3, 4, and at least oneof these shafts 1() extends to the outside so that the inter- 4ov meshedgears can be rotated by power applied to said shaft. The inside of thecasing is contoured to provide two cylindrical surfaces generated aboutcenters coinciding with the centers of the shafts on which the gears.are mounted so that the teeth of the spur gears contact the casing wallon the sides of the gears opposite to that of the gear intermesh.

On one side of the line between the gear centers this cylindricalconfiguration is car- 192s. seran No. 273,729.

ried toward the zone of gear intermesh t0 -a po1nt]u st short of that atwhich interference W1th said intermesh would take place. On the oppositeside of the casing this cylindrical contourmg eXter ds a lesser amountabout the perlphe of the gear, the casing at this point being sustantially a plain surface. An intake port 13 is disposed from thissurface of the casing, the port having the nozzle of an intake pipe 14screwed into its outer end.

.The out-let port 15 of the closure thus provided is formed in one endplate in the proximity of the zone of gear intermesh and pref-- erablybetween the line joining the centers of the. gear shafts and thetermination of the cylindrical portion of the casing which eX- tendstoward the'zone of intermesh. The outlet port is provided with a nozzle16 screwed into its outer end.

The gear teeth are provided with passageways or recesses 17 extendingthrough them. These passageways are open to the casing ad-- jacent tothe crown of the tooth as at 18 and also endwise of the gears as at 19.The gears are rotated as indicated by the arrows on Figure 1 so that theteeth travel about the cylindrical casing wall and pass the outlet portjust before going into full intermesh. The outlet port is larger on the`inside of the plate than on the outside of the plate and fiaresinwardly to provide a greater cross section on the inside and a maximumdiameter a bit to one side of the line between the gear centers. Theflared portion of the port is disposed so as to register or communicatewith the incoming tooth spaces prior to the encroachment of opposingteeth on these sp .ces.

The result is as follows: The fluid or liquid being pumped enters thecasing through the inlet port which delivers it into the path of therevolving gear teeth which pick it up, entrap it in the spaces betweenthem, and carry it along the wall of the casing to the zone ofintermesh. Prior to the actual entrance of each tooth into the spacebetween the teeth of the opposing gear, the trapped fluid or liquid isbeing discharged through the flared portion of the port, As each toothenters the pocket between the two teeth of the opposing gear it forcesthe liquidv or fluid 'trout said pocket through its own recess and outoit said recess endwise and thus through the outlet port.

It will be apparent, ol. course, to those skilled in thc art, that thisdevice can be used as a luid or liquid pressure motor instead ot as apump simply by reversing the direction ot' liquid flow. In other words,it liquid is forced into this device under pressure through the port 15in the closure plate said pressure rotates the gears in the directionopposite to that disclosed in Figure l and escapes around the sides ofthe gears, being carried between the teeth and inally passed out throughthe port in the casing. It is to be noted also that in this operationthe fluid or liquid between the teeth tends to lubricate the cylindricalWall or cushion the gear against it so that the same is not worn so muchby the contact of the gear teeth with it.

Whether this device is used as a pump or a motor the recesses may bedisposed at various points optionally about the periphery of the gears.But it is considered preferable for many uses to place'such recessesadjacent to the crowns of the gear teeth with the peripheral openings onthe side of the gear tooth in the direc-tion of the gear rotation whenused as a pump.

I-Iaving described my invention, I claim:

1. A rotary pump comprising a closure, a pair ot intermeshing gearsmounted within said closure, means for driving said gears, an intakeport for said rotor for disposing fluid in the path of gear rotation,the teeth of said gears contacting the closure walls 'from the point ofintake to the zone of intermesh, forming sealed travelling pocketsbetween thel teeth, a discharge port formed in the closure side walllaterally of the Zone of intermesh, said port formed to communicate withthe loaded pockets between the teeth prior to and at the time ofcomplete opposing teeth encroachment on these pockets, and dischargeopenings formed through said teeth extending from the crowns thereof tothe ends.

2. A rotary pump, comprising, a closure, a pair of intermeshing gearsmounted within said closure, means for rotating said gears, said closurehaving an intake port at the unmeshing side of the gears and a dischargeport extending from the zone of gear intermesh, the teeth of said gearshaving passageways therein extending from the crown of each tooth to theend thereof, said endwise openings successively aligning with thedischarge port for discharging fluid trapped between the intermeshingteeth, and said discharge port flared toward the inside of the y closureand toward the zone of the incoming teeth to provide a primary dischargepassageway for the incoming spaces between the teeth prior to teethintermesh.

3. A rotary pump, comprising, a closure, a

`pair of intermeshing gears mounted within said closure, means forrotating said gears, said closure having an intake port for introducingfluid into the zone of gear unmesh and a discharge port extending fromthe zone ot gear intermesh, said discharge port having a small outletportion and a flared mouth extending into the zone of the incomingspaces between the teeth.

In witness whereof, I hereunto subscribe my name.

CLYDE G. BUTLER.

